The Secrets Of Sandpaper

Kategorie: Wissen und Wissenschaft
Kanal: A Moment of Science
Datum: 1. September 2020, 15:24
Stufe: B1-B2 (Mittelstufe)

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Sandpaper isn't made of ordinary sand, it's made of abrasive minerals like aluminum oxide or garnet that are glued onto a paper backing.